摘要
传统的循环压耗计算模型主要是针对浅井和中深井,其温度和压力对钻井液流变性和密度的影响小,因此精度能够满足工程需要。但高温、高压环境下的超深井钻井,温度和压力对钻井液密度和流变特性的影响已不能忽略。为了使钻头得到更多的压力降和水功率,尽量减小钻井液传递过程中能量的损耗,就必须准确求得循环系统压力损耗。鉴于此,建立了考虑温度、压力效应的超深井钻井循环压耗计算模型,并编制了应用软件。计算结果表明,计算的循环压耗与实际压耗符合率在95%以上;考虑温度、压力效应的循环压耗与不考虑温度、压力效应的循环压耗相差3 MPa左右,这为增大喷嘴压力降、开展超深井钻井喷射钻井提供了理论指导。
The traditional calculation model of pressure loss is mainly suitable for shallow and mid-depth wells. As for the superdeep hole drilling in the high temperature and high pressure, the effects of temperature and pressure on drilling fluid density and rheology cannot be ignored. To help the drilling bit obtain more pressure drop and water power and reduce the energy loss of drilling fluid as much as possible in the process of its transmission, the pressure loss of the circulation system must be solved exactly. Therefore, the calculation model of circulation pressure loss in superdeep well drilling was established considering temperature and pressure effect. The application software was compiled. The calculation shows that the circulation pressure loss calculated is in agreement with the practical pressure loss by more than 95%. There is a difference of about 3 MPa between circulation pressure loss considering temperature and pressure effect and that without considering temperature and pressure effect. The study offers the theoretical guidance for increasing nozzle pressure drop and developing superdeep well jet drilling.
出处
《石油机械》
北大核心
2013年第7期11-14,共4页
China Petroleum Machinery
基金
国家科技重大专项"复杂结构井钻井配套技术"(2011ZX05022-002)
关键词
超深井
循环压耗
计算模型
温度
压力
钻井液
密度
黏度
superdeep well
circulation pressure loss
calculation model
temperature
pressure
drilling fluid
density
viscosity
